Application of the generalised frequency-shift correction for the lower frequency dipole modes of model ℳ visualised in an inertia diagram. The frequencies of the uncorrected resonance frequencies (dotted lines), corrected resonance frequencies from an exact fit to model ℳ (dashed lines) and the generalised model-corrected resonance frequencies (solid lines) are shown. Note that the exact and generalised corrections almost overlap in all acoustic resonances. The minimal size of the subsequently imposed scanning interval is indicated by the surrounding shaded bands.